I do want to get one thing out of the way. Hand checking doesn't work on a bigger, stronger and faster player. In fact it works to their advantage. Malone and Barkley used it as leverage to spin toward the basket.

I want to get one thing out of the way: hand checking works on everyone. It's called physics.

Anyway, Lebron would still be dominant, but he wouldn't be putting up the numbers he is today, especially efficiency-wise (he could certainly average 27/8/6 or whatever on a good team).